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I am still aware of problems redirecting through both iee.org and theiet.org. aliases. This has been going on since before Christmas. I believe the problems are intermittent though the frequency seems to have got worse and it is currently fairly repeatable. I have previously sent you a problem report with attachments and it is probably not helpful to conduct a detailed dissection of your investigation on here in public.

However, from the returned mail response I am getting indicating non-delivery I am led to believe that the DNS name server being used by the IET redirector (or perhaps by MessageLabs since it seems that all mail goes via them) is sometimes taking too long to respond (or perhaps failing to respond altogether), so the target recipient therefore cannot be reached. My concern is that if this is happening then it won't just be happening to me and other people will be losing messages but not knowing it.

I am wondering if you have visibility of how many redirected email messages your system fails to deliver (after non-existent email addresses filtered out)? In other words do you have any visibility of the quality of service which the email redirectors are providing? Or is it simply a "best-effort" service - in which case perhaps users should know this because many are probably relying on this for business critical use?